Note 15 - Equity Incentive Plans - Fair Value of Shared-based Payment Awards (Details) |
12 Months Ended | |
|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
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| Dividend yield | 0.00% | |
| A&R 2021 Plan, Amended [Member] | ||
| Expected volatility, minimum | 125.86% | 114.62% |
| Expected volatility, maximum | 140.57% | 119.28% |
| Risk-free interest rate, minimum | 3.77% | 3.83% |
| Risk-free interest rate, maximum | 4.05% | 4.40% |
| A&R 2021 Plan, Amended [Member] | Minimum [Member] | ||
| Expected life (in years) (Year) | 5 years 3 months 21 days | 5 years 2 months 23 days |
| Dividend yield | 0.00% | 0.00% |
| A&R 2021 Plan, Amended [Member] | Maximum [Member] | ||
| Expected life (in years) (Year) | 6 years 1 month 9 days | 5 years 7 months 28 days |
| Dividend yield | 0.00% | 0.00% |
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition The estimated measure of the maximum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition The estimated measure of the minimum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition The maximum risk-free interest rate assumption that is used in valuing an option on its own shares. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition The minimum risk-free interest rate assumption that is used in valuing an option on its own shares. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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